Convert Roentgens to Nanocoulombs per kilogram
Convert Roentgens (R) to Nanocoulombs per kilogram (nC/kg) instantly and accurately.
Conversion Formula
nC/kg = R × 258000
About Roentgens
The roentgen (R) equals exactly 2.58 × 10⁻⁴ C/kg, the historical unit of X-ray and gamma-ray exposure defined in 1928 (ICRU) and redefined exactly in 1962. Still widely used in the US: field survey instruments read in R/h; NRC and EPA regulations cite R and mR; the Chernobyl accounts famously reported readings in R/h. 1 R = 2.58 × 10⁻⁴ C/kg.
About Nanocoulombs per kilogram
The nanocoulomb per kilogram (nC/kg) equals 10⁻⁹ C/kg. Used in modern SI-based environmental radiation monitoring; equivalent to ~3.88 µR. National metrology institutes calibrate secondary standard ionisation chambers with responses expressed in nC/kg. 1 nC/kg = 10⁻⁹ C/kg = 10⁻³ µC/kg.
Quick Reference Table
| Roentgens (R) | Nanocoulombs per kilogram (nC/kg) |
|---|---|
| 1 R | 258000 nC/kg |
| 2 R | 516000 nC/kg |
| 5 R | 1290000 nC/kg |
| 10 R | 2580000 nC/kg |
| 25 R | 6450000 nC/kg |
| 50 R | 12900000 nC/kg |
| 100 R | 25800000 nC/kg |